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Date:      Tue, 29 Apr 1997 09:04:37 +0200
From:      j@uriah.heep.sax.de (J Wunsch)
To:        freebsd-hackers@freebsd.org
Subject:   Re: A Desparate Plea for Help...
Message-ID:  <19970429090437.IE27356@uriah.heep.sax.de>
In-Reply-To: <XFMail.970428184022.Shimon@i-Connect.Net>; from Simon Shapiro on Apr 28, 1997 08:44:34 -0700
References:  <199704280221.LAA13874@genesis.atrad.adelaide.edu.au> <XFMail.970428184022.Shimon@i-Connect.Net>

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As Simon Shapiro wrote:

> I have surrounded this code with printf's.  Quite few of them.
> The result was a crash with trap 9 in generic_bzero + 0x0f.

This is a General Protection Fault.  These are segment-register
related, and since we don't use segment registers, they cannot
happen. :)  I've seen it on bad hardware, on some serial console
DDB condition (where Bruce had some explanation for it).  Maybe it's
a printf-non-reentrancy issue here.

> This was preceeded with several calls to _end.

This means you're using some LKM (maybe involunteerely, what does
`modstat' say during normal operation?).

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)



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